D634-512A is a pilotless direct-drive servo valve of MOOG D634 series, conforming to ISO4401-05 (NG10). It adopts 24VDC integrated PWM drive and built-in LVDT spool closed-loop feedback. Featuring pressure-independent dynamic property and excellent contamination resistance, it fits high-power and high-precision closed-loop hydraulic systems.

Brand: MOOGModel: D634-512ACategory: Pilotless electro-hydraulic direct drive servo valveMounting Standard: ISO4401-05 (NG10)Drive Mode: Permanent magnet linear force motor, no pilot oil requiredPower Supply: 24VDC, operating range 18-32VDCFeedback Type: Built-in LVDT spool position detectionReset Mode: Spring centering, automatically returns to neutral position when power offProtection Class: IP65Weight: Approx. 6.3kgConnector: M18 6-pin with PE terminal

Core Function: Accurately regulate hydraulic flow and direction via analog signals, realizing closed-loop control of position, velocity, pressure and thrust. It owns low hysteresis, high repeat accuracy and pressure-stable dynamic response.Product Positioning: High flow and high response model, suitable for heavy-duty conditions with continuous large flow and steady control precision.

Max working pressure: 350barMax T-port pressure: ≤50bar (without Y port), ≤350bar (with Y port)Rated flow at 35bar pressure drop: 135L/minPeak flow: Approx. 210L/minNull internal leakage: 0.25-1.7L/minApplicable fluid: ISO11158 mineral oilFluid temperature: -20℃ ~ 80℃Fluid cleanliness: ISO4406 17/14/11

Full stroke step response: ≤8.5ms-3dB frequency bandwidth: 80-100HzHysteresis: ＜0.10% full scaleControl resolution: ＜0.04% full scaleTemperature drift: ＜0.8% full scale

Standard control signal: ±10VDCOptional signal: ±10mA, 4-20mASpool feedback signal: 0-10VDCAmbient temperature: -20℃ ~ 60℃Certification: CE compliant

Shielded twisted signal cable, M18 waterproof connectorISO4401-05 standard valve mounting baseHigh precision hydraulic filter24VDC low ripple stabilized power supplyServo controller, displacement and pressure sensors

High-load hydraulic pressing machineryLarge injection molding and die-casting equipmentHigh-frequency vibration and material fatigue test standsWind turbine pitch control systemHeavy forging and extrusion production linesAerospace motion simulation devices